I can't say I know of a study. You could have a point. But when very experienced pilots are being killed on a regular basis it begs the questions 1) is this a safe glider for spin training and 2) should we be doing such training at all.

I have not seen a report of such a high percentage of incidents in any other glider, such as an L-13, which had many multiples of the number of Puchaczs in service.